I'm probably older than you. What's your point?
It is entirely permissible to refine one's stance in an argument as the discourse develops. It layman's terms, this is called a conversation. This two-way process allows a continuing exchange of ideas that can eventually lead to an accurate and thorough understanding of the viewpoints maintained by the parties in the conversation. This technique is frequently used in all sorts of human endeavors. The educational process often uses this approach. Engineering processes use this approach.
Lovely. However, dragging your fellow conversant off on tangents to avoid an admission that you overstepped yourself initially is simply juvenile. Alternatively, holding forth on something tangential and uninteresting to other participants in the conversation is boorish.
I'll give you the benefit of the doubt and assume you wish to be neither.
The point is that you seem to be dismissing facts in a discourse you chose to enter merely because I misspoke my opening lines. That is not how conversations are used to refine understandings, at least not in polite society among educated people. Please recall that it is you who responded adversely to my statement, and with good reason. Now you are taking offense that I can defend my position merely by stating the conditions under which my assertionas are true. It is like you would prefer that your car can defy physics just because it is expensive and precious to you.