I agree with the all factors described above, from genotype, sex hormones to stressfull lifestyle of males. In my opinion the another factor which may influence lifespan is physical activity. Women are physically more active than men, they move in a kitchen preparing meals, washing, they care about children, regularly. This exercise is done in their "free" time. They train their hearts an circulation on daily basis.  Men usually watch TV in their free time.

The physiological differences between male and female appear to be the factors making males more vulnerable to heart diseases. The food habits, sitting office jobs, minimal physical activities, stressful professional and family life besides hormonal differences are main reasons for cardiac problems.
When couples work distantly and sex urgencies are not met, happy hormones are missed. 
Aging and lack of physical activities build more adipose, clogging arteries and hypertension! 
Hence more heart attacks!

Males than females are more vulnerable to cardiovascular diseases because these diseases are stress related diseases, while stress-induced release of epinephrine and norepinephrine is greater in males, which results in greater cardiovascular disease related death in men than women.

La mujer tiene un efecto protector por las hormonas que la favorece de todas maneras las enfermedades cardiovasculares estan aumentando en varias areas del planeta en mi propia experiencia haciendo Cirugia Coronaria desde 1972 al principio no operabamos mujeres y a partir de los 80 todo cambio y llegamos casi hasta el 30% seg por que la mujer empezo a tomar un rol mas activo en la sociedad y a fumar mas Pero aun son mas longevas que el hombre pero la variacion es muy grande de lugar a lugar

Beside the already mentioned reasons, further reasons could be:
1. Its not the only disease/character where gender specific differences appear.
2. Females have different metabolism.
3. Females have high fat under skin and probably different in vessels.
4. Levels of anxiety and its toleration  limits are different between males and females due to socio-economic and cultural factors.
5. The percentage of working women is lesser if all world is considered for data, therefore comparison itself is skewed i.e. among working and non-working individuals.

There is evidence that causally links the loss of the degenerated chromosome (Y) in diseases with increased mortality, and aggressiveness of heart disease or cancer. It is also known that -in males-many cells in the body completely lose the Y chromosome in old age. Surely the observation in the death rates mentioned is multifactorial, but the genetic determinant linked to sex and the degeneration of the Y chromosome is a very important factor: https://www.science.org/content/article/men-lose-y-chromosomes-they-age-it-may-be-harming-their-hearts

There a lot of factors those influnces this issue. Maybe the simplest one is the protective effects of sex hormones in females. For more information this article is usefule.

It could be due to a missing X chromosome and is the topic of debate with the complete sequencing of the Y chromosome lately. 

I disagree with the assertion that dietary habits cannot change. Combined with exercise, eating a Mediterranean diet high in omega-3 fatty acids and engaging in regular aerobic exercise can do a lot for cardiovascular health. To improve male cardiovascular outcomes despite male endocrine disadvantages, a cultural shift promoting aerobic exercise and dietary change for men would be a welcome development. Additionally, framing help-seeking behaviors as an integral part of male hygiene rather than as a sign of personal weakness could go a long way. Managing chronic health conditions such as hypertension, diabetes and dyslipidemia requires at least some degree of clinical support. Seeking out these resources proactively should be normalized and encouraged.

 women are somewhat protected by estrogen and progesterone until they pass through menopause. these hormones are largely responsible for reproductive duties, they also boost blood vessel health.so they remain protected

La mujer tiene el efecto protector hormonal hasta los 50 años de edad posteriormente la  tasas de mortalidad tienden a igualarse. En general el hombre se ve sometido al estrés generado por los procesos productivos y a sistemas de salud limitados. 

Most of risky jobs are taken by the men and they have to bear stress from home and outside world

Men are usually exposed to more economic and social pressures and stress.