If you put Joel 2 for the church you ignore the scripture!
Ac 2:17 And it shall come to pass in the last days, saith God, I will pour out of my Spirit upon all flesh: and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall dream dreams:
Peter cites accurately Joel 2 and matches the Spirit upon all flesh which includes Gentiles and delineates it from your sons and your daughters.
All flesh is saved by the pouring out of the Holy Spirit but Israel is chosen for evidence of gifts as a witness to them of Jehovah Gods provision of their Messiah.
For the cause of Christ
Roger