"We have to live and enjoy the present." No you don't. There's no mandate that states you have to enjoy the present. If you're not enjoying your present, that doesn't mean there's something wrong with you. Garbage message.
"That's why you have to make loads of friends and experience your own fantastic romance." What is why? Is having loads of friends and a romance the only way to enjoy yourself? That's how people end up in miserable relationships. Because "at least you're not alone." Garbage message.
"Now is your best opportunity to make plenty of enjoyable memories." Why now? Why when you're still trying to discover who you are? Why when you're at your most vulnerable age? When you're most easily taken advantage of? Why would that be the best time for it? Remove your rose-tinted glasses, please. Garbage message.
Add in the 'loveable' but patronising headpat (to Hishiro's knowledge Kaizaki is not ten years older than her), and I just can't. And of course she just says "Yeah." Like who the hell is he to lecture her over this? I don't care that he thinks he knows it all, or has experienced it all, you keep your 'wisdom' to yourself unless someone asks you for life advice.