I have a computer which will not used, however, it is about 4-5 years old already,
is it worth to use it to mine BTC?
If yes, how much will I expect to get in 1 month
What are the specs of your computer? I'm surpised no one has asked this. If you have a 24 core processor or something ridiculous then maybe it's worth it. Also depends on where you live because electricity bills vary by location.
Sure, but the OP mentioned it was 4-5 years old already... My Dual L5420 runs 8 threads on XEON cpu's, mining XMG whenever it has some spare cpu cycles (it's running a miner on very low priority). It makes only 5-8 cents a day... Even if it was a server with 24 XEON cores, 4 threads, but 4-5 years old, it would still only make $1/day if used for mining... Or maybe my configuration of my server is way of, and i could be making a lot more than i am ;-)