RTD is heavy-handed with a lot of stuff. This was Doctor who, but he still found a way tp put Gwen centre-stage. I think Ianto is as tired ass everyone else of seeing Gwen throw herself at men. After all, Ianto would be the first person to say that age isn't important. Jack really would have been technically older than the Doctor at that point, though in real terms it would depend on how much of his close to two thousand year burial he'd actually been alive. I suspect most of that time he would have been more dead than alive.