I mentioned below that faith can perhaps best be defined as the adherence of the heart to God. It is so because a simple belief in something is not enough (Marxists, for example, are also firmly convinced), but there must be a relationship behind it. Not only do I believe in something, but there is a reason why, and it is based on a confidential relationship with a person - and the acquaintance of his. Abraham believed the more he walked with God and the more he knew Him. Therefore, it is possible to still grow in faith regardless of age, which is why the "old wine is better". But this applies only if it can mature with the age, not degrade.