The station IS old. Their grandparents who came of age in the 1970s listened to KIIS. The kids likely already know that by now if they're casually listening to it on something and Grandpa walks in 'Oh yes, KIIS. I used to listen to that station when I met your grandma"
Or their Backstreet Boys obsessed mom might say something in the car." Oh KIIS! Rick Dees was so funny! Is he still there?"
Unless the kids go out of their way to hide their music choices from their parents (and unless their parents are strict religious, they usually don't), it's likely already been brought up before how old KIIS or any heritage CHR is if that's what their kids are listening to.
As David points out, it's of dubious value if you have an adult audience. If you're targeting a younger audience, it's potentially deadly.
KHJ used to celebrate their "birthdays"---the anniversary of the launch of Boss Radio in 1965. It was a big deal.
In 1966, a souvenir booklet, a KHJ Boss Goldens album and a giveaway including a swimming pool, a color TV, a scuba diving outfit, a complete wardrobe, a motorcycle or a round-trip vacation to Hawaii. To enter, you sent them a birthday card, and you qualified by random drawing.
In 1967, they did it again, but turned it into a birthday card contest. They all had to be home-made and were judged for originality "and soul". Grand prize was a Pontiac Firebird 400 convertible.
In '68, more birthday cards---this time, just a color TV.
And in 1969---well, I wrote about this two years ago on this forum, so let's just cut and paste:
In 1969, the "Birthday Payday" contest celebrating KHJ's fourth anniversary as "Boss Radio". Each hour, KHJ would announce some sort of historic event, but withhold the date. If you were whatever number caller, you told them your birthday (month and day) and if your birthday matched the date of the historical event, which they'd announce on the air, you won whatever the jackpot was.
It launched on Wednesday afternoon, April 30 with $2,500 ($18,801 in today's money) and went up by ten bucks each time they had a loser.
Their winner happened overnight Friday night into Saturday morning, May 3. $2,920. Too soon, too little, wrong daypart. Sucks for promotion, so KHJ figures it's worth it to re-launch the contest with another $2,500 Monday morning.
A second winner 45 hours after re-launch---$2,950. Again in overnights on May 7.
So, KHJ, made of money in those days, decides to roll the dice one more time, and re-set the jackpot to $2,500, with ten bucks added each hour until the jackpot is won.
And every hour of every day for the rest of the May---nobody wins. By May 30, the jackpot is $8,020 ($60,150.66 in today's money). On the back of the May 28 Boss 30, there's a promo that reads:
"On July 16, 1969, the United States is scheduled to rocket the first man to the moon! If the "Birthday Payday" jackpot hasn't been won by then, it'll be worth $18,230 in KHJ cash!"
That, by the way, is $135,240 in today's money.
The trouble is that the official rules for the contest didn't give an end date.
Well, it didn't go that far---but the jackpot got up to $10,420 ($87,593 adjusted) before Mrs. Effie Boldinger won that---at 3:11 a.m. Total payout: $16,290 ($136,938 adjusted).
The next year, 1970---there was a picture of Bill Wade holding a piece of birthday cake on the cover of the Boss 30. That's literally all.
And from 1971 on, there were no more mentions of "Boss Birthday".
Would they have stopped without the 1969 fiasco? Probably. Six years is a third the lifetime of an 18-year old, and Top 40 was all about the (then) current moment.