

Yes, but the process of breaking down, as you mentioned, can be slowed down by eating healthy and exercising regularly, such as walking for at least an hour a day. For example, when my grandfather was in his 70s, he could easily climb a mountain, whereas I struggled. He had a lot of energy at that age and could walk for hours without stopping.
Your body breaks down faster if you become inactive as a pensioner.
As the other commenters said, it is illegal. The most important thing is to be informed about your rights so that people and companies do not take advantage of you.