That's a good question, I'd say tread likely like you are. You said he was more a companion than an SO at this time, and thats a very good relationship status to keep among you before you feel emotionally ready to be with each other as a partnership. I say this mainly because most of my online relationships havent been about building romantic relationships, that came later.
The thing is with online you have to rely on a plethora of different messages and communications since you dont have face to face. Exchanging a lot of pictures and emphasizing emotion through other means helps. When you meet someone online who only wants you for sex/romance they can very easily play you as a fake persona on a screen. Most of my friendships online have been genuine because neither of us were necessarily trying to get anything out of the other, and we've known each other for awhile (a year or years, even) before we met up in person.
If there's anything to be anxious about, its going to be height, voice, nonverbal habits, living habits, etc. Stuff you dont get as much of communicating online. Meeting in person in a sense will be a very different experience, in a way you will be experiencing new proximity things most people experience first, rather than the emotional connection second. This might throw them for a loop or they might adjust to it, but it may take a little time. I wouldnt worry too much though since odds are if they like you well enough and youre emotionally connected, they'll learn to adjust to those things since youre the same person online as you are offline. Odds are they havent forgotten your interests and unique traits that make you you.
Congrats and good luck, then. An old dude like you deserves that companionship with a nice guy.
