This novel is about a character who jumps back in time to relive his life. It's called “replayer” or something like that but Google didn’t help with the variations I tried.
He’s in his office talking on his phone to his wife, and she is saying “We have to…” and he feels like he has a heart attack, and wakes up in a “very messy room” which he quickly discovers is his young self.
Each time his life ends at the exact same date and time, but each jump is not as far back.
He meets another replayer and they have a love spanning many lifetimes. He (as a rich hermit) first notices her because of a movie she made.
to try and find others, they posted a newpaper ad with the “remember when” theme, listing slogans from the future. A few replied with wrong ideas about what the ad was concerning. One replied with proof of his own, adding Tylonol Scare and Princess Di to the list.
They knew which stocks to but for long-term investment, simply from remembering brand names in the future. Investment consultants were the cover they used when visiting the other guy they had found (who was in an institution for the criminally insane, BTW).
What novel is this?