"I never dared to be radical when young for fear it would make me conservative when old"

This quote by Robert Frost talks to the concept of bewaring in one's youth, for fear of becoming too conservative in one's aging. Frost is suggesting that if one is too radical in their youth, they may end up being too conservative in their aging. He is warning versus the dangers of being too severe in one's beliefs, as it could cause a more conservative outlook in the future. This might be interpreted as a caution against the dangers of extremism, and a suggestion to be conscious of one's beliefs and actions. Frost is suggesting that it is very important to be conscious of one's beliefs and actions, as they could have a lasting effect on one's future. He is also suggesting that it is important to be open to originalities and perspectives, as this could assist to prevent one from ending up being too conservative in their old age.