We certainly seen plenty of both high and low time pilots. Average, for civilians when I went through was about 6,000 hours with 2,000+ 121 PIC. The military pilots varied quite a bit from low time fighter pilots to higher time transport pilots. A long leg in a Harrier is something like 40 minutes, if it does not quit and fall out of the sky before then. (do Harrier pilots log the time hanging under their parachutes? ... could be significant extra block)

Delta says they look at the whole package.

For (ahem) higher time pilots, it would help to show accomplishments in addition to flying the line.

Delta has got a huge pile of 45 to 55 year old First Officers. While Delta has never even hinted that they hire to distribute the retirement curve, common sense tells me Delta needs what it doesn't have, younger First Officers. That is just my guess.