It is indeed, actually, though perhaps a little liberty has been taken with the translation - also keep in mind that Socrates is kind of a funny case historically(*), because he didn't write stuff; others quoted him and then did the writing, so what we have is more a quote of a quote in every case regarding him:

https://en.wikiquote.org/wiki/Socrates

>It is a disgrace to grow old through sheer carelessness before seeing what manner of man you may become by developing your bodily strength and beauty to their highest limit. But you cannot see that, if you are careless; for it will not come of its own accord.

Attributed to Socrates in Memorabilia by Xenophon.

(*) though not uniquely - Laozi, in China, is much the same way.