I have made a game PingPong which is a little similar with brick mania with some advance features . My question is that are people of this generation still interested in such patience level game where one has to keep playing patiently for a long time , or they just want a short fun to play material?

I do not know what a brick mania is, but your game looks a bit like the principle of breakout, a game from 1976.

https://itch.io/games/tag-breakout

Will you have millions of players? Probably not. Platformers are not really popular and still contribute 130k games of the 900k games on itch. Breakout style games are maybe 1k to 10k games here, as not all tag breakout.

As for generation preference, especially the older players might not be interested in such games.  They did play them when younger and moved on since. Younger players might be new to the concept and find it interesting. In the essence it is an arcade game. You play it for less than an hour and it has little to no story and requires manual dexterity and reflexes. There are people that like that type of games, others do not. Though I can not tell, if there is any preference due to age. Back in the day there just was no diversity in games. People played what was available. Now you have to compete against all those new game concepts and a plethora of retro games.

I guess it might be more popular on mobile than on desktop platform.