There are an enormous number of ways to do B&W conversions, and, I'm sure that by using a search engine, you could find many of these for yourself. There are native tools built into Photoshop (eg, "desaturate", "B&W adjustment layer"); there are commercial plugins (eg,
Silver Efx Pro,
the B&W presets in Analog Efx Pro,
VanDerLee's Old Movie, etc. etc.); and, there are thousands of examples of do-it-yourself methods that are described on this and other forums that put together various combinations of other techniques. Many of these even offer free trial periods so you can experiment with the effects they can produce.
So, I don't think that finding information on methods could possibly be a problem for you.
Instead, I suggest you think about the many possible "looks" available to you instead of first looking at the methods to get those "looks". The two are not synonymous.
Specifically, I suggest you think about the psychological effect the various treatments might have on the recipient. For example, assuming you have older children, how would you feel if you received a serious (not a joke) photo gift from them that shows you in a fake faded, sepia toned print with intentional imperfections like burned edges, cracks, fake crinkled paper texture. Might this not tell you that they perceive you as antiquated and no longer part of current events?
Analogously, how do you think "grandma" might feel to receive such a gift from you? She might love it, she may have even expressed a desire for something like this. On the other hand, there's a very good chance it might depress her -- only you and your family know for sure.
Personally, when I am preparing gifts such as these, I try to include people and things that the recipient is fond of, and then shoot and process the images "straight", either color or B&W, but certainly with nothing to make them seem artificially older than they really are. In fact, I might even soften the wrinkles just a tiny bit so that they look good for their age TO A BELIEVABLE DEGREE.
Fortunately or unfortunately, I have taken the last "good" photograph of several elderly people before they died. I shot them all straight, often with members of their family or hobby items in the photo. The subjects loved them, and I can tell you that when they passed away and their families requested a copy, they would have been extraordinarily upset if I had used any fake efx on their loved one.
Just my $0.02,
Tom