Ask Bill why this would happen. Make sure you get specific physiological reasons.
Skin loses elasticity due to declining elastin levels, which is a natural process of aging. The ONLY possible contribution bench pressing would have would be if you built massive pecs and let them atrophy quickly by abruptly stopping to lift and eat in your later years. Solution? Just keep training, if even only once a week with lighter weights (which is important for successful aging anyway).