the highest suicide rate is among people 85 years or older. With the advancement of healthcare people are living longer. So the rate of suicide amongst younger demographics most likely has declined slightly
People's experience change their perspective. What's important to you now will change. What you're able to appreciate changes.
If you remain active through your life, I think you're much more likely to stay active as you're older. I intend to retire by 40, but I don't intend to be idle.