No reason to be afraid of age in the NFL, especially with a GM that appears to have AP's contractual foresight. Just gotta find the right balance between money and term like in every sport, but also between "still definitely has gas in the tank" and "willing to sign for a song for a couple last whacks at a Super Bowl."
Wagner's a bit of a unicorn, but a good example of what I'm talking about. Ertz is a bit more realistic. Definitely shows his age, but has a reliable veteran savvy that pays dividends. Both are team-oriented leaders mentoring the hell out of young players just by being here and doing their thing.
There always seems to be a handful of these guys bouncing around the league every year. Keep your radar locked onto that type of guy and continue drafting well and you'll build a complete team in no time. No shame at all in finding the right 30+ guys to wring 2-3 solid years out of.
It's the big, splashy moves and albatross contracts that sink teams.