Goal weight?

Hi Brooke! I am 51 and almost 5’10”, and currently weigh 159 (I’d been 210 a year ago.) I am wondering what my goal weight should be. When my husband and I started dating 25 years ago I was about 135-but I think that may be too thin at this point. I am loving being able to wear size 8 and 10s-I never thought this day would come! Thank you.