Usually if an obit mentions high school at all, it's just a quick "went to Bob Dobson High School, graduated Class of '69" before continuing on to more recent info. The only time you see obits digging that far back for someone who is older than 25 is if their accomplishments as an adult didn't amount to jack shit and they're wanting to play for more sympathy for the deceased, or whoever is paying for the obit decided to get wordy and was willing to pay for the extra lines.