37f - 233lbs - Am I to old

So I am 37f and I am now the heaviest I have ever been. I really feel it in my body now too. Things hurt that didn't and I just feel the weight.

My whole family is a bit larger and then I have also constantly been told its hard/impossible to lose weight as I age. So I just feel really sad and discouraged.

I used to be a decent rock climber and now that feels impossible and I just want to get my body and fitness back.

My goal weight is 150-160lbs is that impossible? If I am on it, how much could I lose by summer?