I'm very forgetful. does that go along with hypothyroidism?

Not commonly..: Stress/anxiety/ B12 deficiency/sleep disorder....so many other things can cause it.

Possible: Poor memory and concentration can be symptoms of hypothyroidism, which you have according to your profile. Discuss with doctor treating your thyroid to make sure this isn't a contributing factor. Other causes of forgetfulness at your age could be lack of sleep, medication side effects, depression, stress and anxiety, vitamin deficiency, head injury, seizures, alcohol abuse, drug use and smoking.