Men reach peak strength in their 30's and beyond.
Get your T-levels checked if you are worried about them. If they are below the normal range, try T-boosters (Alpha Male) or get the doc to give you something. If it's normal, then stop making excuses and work hard to achieve your goals.
I'm 30, and I'm at my strongest and biggest ever. And I continue to make gains nearly every single week.
My friend is 37 and still competes in Olympic weightlifting and places in the top 3 nationally. He's strong as hell and eats like shit compared to me (maybe three decent meals a day). Hard work pays off (genetics can help too).
Get off the excuse wagon and train hard and eat right.