Being in your 40s isn’t the same as being in your 20s or 30s healthwise. Things tend to slow down. It’s time to watch out for the health issues as the consequences only get worse as grow older.
If you haven't been very active, now is the best time to get fit and look out for your diet. At this time, your body’s not too old to be trained. You most likely now have a lot more domestic responsibilities. Here are health issues you need to watch out for in your 40s:

1. The big ailments: To encounter serious issues such as heart disease, Type-II diabetes, cancer, lung disease or stroke you have to be either very unlucky, have a genetic trait, or have really failed to look after yourself until now. However, your risk of these conditions does increase with age.

The key risk factors for the serious health issues are:

being overweight or obese

bad diet

drinking too much

smoking

not exercise regularly

If one or two of these apply to you then it’s time to shape up. Admit the issues you have and seek ways to turn things around, either with a trainer or family support.

2. Prostate cancer: This is the most common cancer in men in the UK, with over 42,000 men diagnosed yearly. The condition claims over 10,500 men annually.

Your prostate is a walnut shaped gland under your bladder, which helps produce semen. However, it can be tough sometimes. The major risks for prostate cancer are:

age – older men are more likely to have it

family history – you’re more likely to get it if a male relative had it

ethnicity – men of color are more likely to develop prostate cancer earlier than other groups of men, including in their 40s.

Unfortunately, treatment is tough as signs usually don’t show until symptoms have spread. However, it’s rare to have prostate cancer before your 50s. Second, most prostate problems are not cancer-related but just infections that can be resolved quickly.

The best cause of treatment is early detection through regular check ups, especially if you know you’re predisposed to it.

read more here - http://jessynaphtali..com.ng/2016/02/men-health-tips.html

With all the many posters and threads claiming masturbation is bad its a little wonder many Nigerian men suffer prostate cancer.
The 40s are years every male should look forward to. If one was active in their teens and 20s, they can easily pick the habit albeit not as intensive. I've seen many examples of people learn to keep fit first time in their lives in their 60s, early 70s even -- if those old dogs could learn a new trick, anyone can.