Back then when I just started bodybuilding, they said I will quit going to the gym in the next 3 months. A year later, they said when I get out of from college and start going to work I won't be able to maintain my physique. And then when I'm working (a 9-6 job) they said I can't maintain a good physique once I get a little older... 6 years later (2014) when I got bulkier people told me that I won't be able to maintain my condition and size once I become a daddy... Today? they will probably say "wait till you __________ (fill up the blank) you won't be able to bla bla bla".
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Lesson: When other people tell you that you can't achieve something, they are telling you based on their own limitations, not yours.
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Stay fit.