I think he's talking about his RL Wife, look at the guys join date...
anyways, i strongly adwise AGAINST trying to fix your marriage by spying on your wife, no matter how.
several reasons:
- adverse effects. Do you really think she's going to think "Oh, he's stalking me and spying on me, i really love him so much for that"...
- violation of TOS of linden labs. all it'll do is get your bum kicked out of SL while your wife is still in there.
Suggestion: try talking to her.
If it turns out to be necessary, marriage counselling.
Suggestion 2: think a bit.
- why did she start to "play" SL?
- why could some pixel guy (or is it a pixel girl) have more meaning to her than you?
my guess is that at least a part of her finding someone else more interesting than you is on your head.
Maybe she's just trying to get the excitement back that you two lost over 40 years of marriage?
For almost anyone "in here" SL is a place to do what you can't do in real life, be it sailing a 120ft classic yacht or trying those kamasutra positions that your chiropractor in RL strongly advises NOT to try.

related story: a close friend of mine almost got a divorce over SL, then she left for a while to fix things with hubby, then suddenly i got an IM from her saying "hey my hubby got himself an SL account, we just eloped to vegas, come and party!"
... last i heard was her being far along a RL pregnancy and all was well again with them.
... what brought her into SL on the first place was her hubby being way too deep into another online game. figures.
now lean back & think. hard.
mistrust & spying = worst possible option.
... how about you jazz up your avi big time & seduce her avi, and then you can live happily ever after in both worlds?