Wow - a lot of people on here giving advice who clearly have absolutely no clue what bondage and/or BDSM is and think they are experts probably just from watching 50 shades... (which has absolutely NOTHING to do with bdsm!).
Firstly - if you're not into it, then you're not into it. I would expect that if you've reached 60 and have never had so much as a single thought about it, it probably isn't for you. I don't blame someone for sharing their fetish with you - but it's ultimately up to you if it's something you want to explore - or don't want to participate in at all. You have that right - and if it's not for you, just tell him. Whether that means the relationship can continue or not is a matter for you both, but you do not HAVE to do this if it's not for you.
For the record - bondage does NOT mean pain. Someone saying they are into bondage does NOT mean they want to hurt you! Bondage covers a LOT - it can be very light, loose, sensual and playful... it can be very comfortable, and very erotic. There are lots of areas of BDSM that do not involve discomfort or extreme bondage, or even real pain. It can be very sensual and it should ultimately be about pleasure first and foremost - yours and his. But it MUST be consensual and safe.
If he is a dominant, then that's what turns him on, but if he is a true, genuine dominant he will not want you to participate in it if it doesn't do anything for you. A true dominant will generally prefer someone who has at least some idea that they have submissive tendencies, even if they haven't experienced it yet. A true dominant is not a bully, or abusive or any of those things. True, genuine, experienced dominants are often very respectful (more so than most vanilla men), extremely caring and will make your safety, comfort and pleasure their priority. Anyone who tries to force you into doing this is not a true dominant and is, indeed, just an abusive muppet. There are sadly some idiots out there who think they are dominants and just use it as an excuse to be rough... but do not confuse bdsm with abuse - they are two very different things. One is consensual pleasure - sometimes mixed with controlled sensual pain (depending on the level the couple wishes to go to), and covers a very wide range of fetishes.... the other is what it says - abuse.
I would have thought that an open but respectful conversation about it would've been a more appropriate starting point rather than sending you rules and pictures of bondage gear! Bit of a red flag in my opinion.