Do you have to get weaker as you age?

Reversing Muscle Weakness in Aging

As we get older not only do our muscles get weaker, but it becomes harder and sometimes impossible to regain muscle strength. Why is this?

Doing molecular research, scientists discovered that there are certain cells, called satellite cells, in muscle, that respond to exercise and training by making new muscle cells and strengthening existing ones. However, as we age these cells become "tired" and do not seem to be able to work as hard.

In looking at young and old satellite cells, they discovered a molecule that seemed to make the cells less vigorous. By blocking production of this the muscles became responsive once again as if they were young.
There is much research needed, but this might be a target to prevent the muscle wasting of aging and can have dramatic consequences!