Age shouldn't be problem unless you are in your late twenties/thirties already. Only problem with age is that the older you get the more responsibilities you have and the harder it is to put in the time and sacrifice time for becoming a pro. Your 16 year old kid can just play all day long because they don't have to worry about work or other stuff like paying bills. Also the older you get less likely will teams give you a chance because they much rather invest in young players than old unless they are really good at what they are doing like Karrigan type of IGL.
and when it comes is it easier or harder as time goes by. Most likely harder. Game evolves and players evolve so you need to learn more and more. And there will be more competition and players as time goes by. Like look at like CSGO. For example its super hard to become pro at that game anymore just because its so advanced and mastered that unless you put in crazy amounts of hours you will never be able to compete even you have good mechanics. Talking about tier 1.
And if you want to become pro you pretty much have to be high rank. Because high immortal/radiant ranked is like unrated for actual pro players. Even tier 2-3 level. Obviously its not always so simple, but for you even getting a chance you likely have to be high ranked. But its all about becoming better and improving so if you put in the time who knows what rank you will hit at some point. And when it comes tech it shouldn't matter too much I don't think. Like if you are playing with 30fps or something then maybe it will have big impact, and having 144hz+ monitor with same FPS helps, but you shouldn't use it too much as excuse unless your setup really really sucks. For example in Overwatch that is obviously different game one of the pros made it top of ranked with 30FPS and 150 ping when they started. Think about that. And again its different game and these things matter more in Valorant, but don't give yourself false hope.
Just typing something that came to my mind. I don't have experience. But good luck in whatever you doing!