They are indeed! Therefore we baptize whom the Bible says to baptize.
'But when they believed Philip as he preached......both men and women were baptized' (Acts 8:12). 100 year old women are still women, therefore we have a mandate to baptize them. We don't have a mandate to baptize women.
Fine by me.
Now
that is an argument from silence.
According to Luke 1:41, the baby leaped in Elizabeth's womb and
she was filled with the Holy Spirit. But it is a huge stretch from one baby leaping in the womb to all babies being regenerate, if that is what you're suggesting.