Will I gain weight as I grow older?

Anonymous
I'm quite lanky just now. I'm 16, 6ft2-ish, 130-140lb-ish and my body type is "ectomorph". also, i'm what's knon aas a hard-gainer so I have to eat more than anyone else if i want to gain weight. I've tried gaining weight before but my motivation is alwayss swayed after a week or two. I've had quite a few people tell me that I'll get bigger as I age and I thought I'd come on here to find out...
Will I gain weight as I grow older?
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