Kerr turns 30 on May 16 and said even though he is a couple of years younger than Darren Glass, Andrew Embley and Dean Cox, he knows time is running out on their chances for more silverware.
"All of us know that we can't play football forever," Kerr said.
"It's just not physically possible when you get to a certain age in football, with the talent and the programs that they have at junior level now, to hold your spot.
"So we know that there is a sense of urgency for us especially because we don't have five or six years left.
"Maximum we probably have four years left for all of us. Probably, more than likely, two."
Kerr believes the five-point loss to Port Adelaide on Saturday night was one of the worst he's ever been involved in.
The 213-game veteran was still coming to terms with his side's capitulation, having led by 41 points at one stage during the third term.
"I'm still in shock now to be honest. It's a tough one to lose," he said.
"It's as disappointing a game as I've been involved in."
Port Adelaide kicked eight of the last nine goals of the match to run over the top of the Eagles, who have now lost not only four of their first five matches, but also lost four of their five final quarters for the year.
"It really did feel late in the game that we were out on our feet and they were running hard," Kerr said.
"I don't think it's a fitness thing, because the pre-season that our guys have done - I wasn't a part of it, but I watched the majority of it - it was A1.
"Whether it was a mental thing or a structural thing, we're not too sure."
West Coast has not shied away from its top four aspirations and at 1-4 it becomes a lot harder, but not impossible.
The Eagles managed to make the top four after a 1-4 in 1996 when they won 11 consecutive matches from round six onwards to finish fourth with 15 wins and seven losses.
Kerr said the top four was still within reach for West Coast.
"While it's a mathematical chance, we're always aiming for it. It's obviously going to be a lot harder, we can't drop as many games," he said.
"With the players we've got coming back and the talent we've got in the group, it's not beyond us, that's for sure."
Kerr said the morale among the group was fine and that they are galvanised to improve their form against the Western Bulldogs on Sunday.
"Personally I find it harder to get up when we've had a string of wins," he said.
"It's very easy to get yourself up when you've had a loss like that. I'm spewing it is such a long break, because you don't get to rectify it quickly.
"It's going to be a long eight-day break, but it won't be hard at all to get ourselves up for the next game."
