I have anxiety and my mom at 80, has struggled with anxiety and depression since her teenage years. My dad managed her challenges until he passed, now my mom is on meds.
First question is, are you aware of your thoughts where you feel depressed or anxious?
You have been struggling since your mid-20s and now you are 85, bravo for making it to 85, managing challenges.

My suggestion, seek a therapist and don’t pursue medications. When you feel depressed or anxious, you are either thinking of the past or future. Breath, go outside, talk to friends. The key is to be present, sure meds could help but at 85, they could do more harm than good.