When you start lifting weights you find out right away what strength is and how you compare to others in the gym. Everyone starts at a different level of genetic strength and every will max out at a different level of strength.
We tend to reach peak strength somewhere around our late 20's or early 30's. After which it's not realistic to expect to continue to get stronger.
Depending on your age, genetics, injury history, and activity goals your strength goals will change. There is no single answer to how strong you should be, there is just how strong you can get, and what that strength can do for your individual goals.
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