I won't quibble about Cheserek's age. It's a great achievement.
But there are a few things worth noting, to demonstrate just how incredibly special Lindgren's record was/is.
1) Cheserek attends a school which has a six year program, teaching 7-12 grades all under one roof; Lindgren entered high school out of junior high, didn't start running until a sophomore. He had exactly half as much time to develop his running ability as Cheserek had.
2) Cheserek ran on an 8 lap dedicated indoor track, which is well suited for fast times; Lindgren ran on an 11 lap RAISED track, which is far more difficult.
3) Lindgren raised in heavy, fixed element spikes
4) When Lindgren ran his time, the OUTDOOR world record for 2 miles was only 11 seconds faster, at 8:29. While Cheserek has broken 8:40, the WR is 42 seconds faster, at 7:58. So if we want to talk about equivalencies relative to world standards, Cheserek needs to drop a sub 8:20 indoors.
5) As Lindgren has also pointed out, which is his whole philosophy to running, he did not pace, he RACED. He challenged the leader Ron Clarke for much of the race, and was only passed in the final stages. Cheserek seized hold of last place and never gave it up. He ran a time; whether he ran a race is another another issue.
So issues of Cheserek's age aside, even though his time is excellent, there really isn't much comparing to Lindgren's which was a product of a different time. It's like Roger Maris breaking Babe Ruth's HR record...sure he did it, but he had many more opportunities and favorable conditions.
So in my opinion, Gerry Lindgren's record will remain one of the all time achievements in prep athletics.