There is some great advice above.
Some techniques I use, some of which have already been mentioned:
1. Know your audience. If you don't know,...ask. As a part-time university instructor and a resource person at work, when I receive a question from someone I know, I already have a feel for where they are in their knowledge, and is easy to just jump in and give them the answers they need. If I don't know, I will start with a leading question like, "Explain to me what you already know about <...> and I will fill in with my answer." This way, I don't insult them by talking down to them and repeating what they already know,...or I don't start talking above their level and loose them in the conversation. One of my autistic traits is to monologue,...I don't want to do that. I want to answer their question as concisely as possible, but like I said earlier, if they don't have the foundation to understand the answer, I might have to elaborate a bit.
2. In my youth, I was a bit insecure in who I was as a person, and I would often try to impress people with my knowledge and intelligence. It only served to alienate me, piss people off,...basically people didn't like me. Between the constant need to open my mouth and monologue on topics, as well as, a youthful cockiness,...it only served to further separate me. Now, many years later, I have learned to keep my mouth shut, smile, and simply take the role of the "friendly instructor". I receive calls every day at work from nurses, doctors, and fellow respiratory therapists. People know they can either take the time to try to look something up,...or simply call me. Most people are busy, simply want a quick answer, and move on with their day.
3. As an aging autistic, you will have had many, many "special interests",...and with that, an ever increasing "library of knowledge", to draw upon. You might be seen as an irritating "know-it-all",...or a friendly resource. How you go about your day and interactions is up to you, but it does take some discipline to pause a second, know who your are dealing with, how are you going to add to this conversation in a positive way, and decide whether to open your mouth or not.