LB- most of the lies you are talking about are fine. The only one I’m unsure of is lying about age for shidduchim. There may be different opinions, so you have to ask a sheilah. Personally, I think it’s a bad idea even if someone is told it’s permissible.
The other examples you gave should all be fine. I understand the discomfort part though. I recently told a shadchan that I was “busy” and not available for dating. I meant that I was busy because I had work that had to be finished within approximately 2 weeks from the day of this conversation and I had decided that I wasn’t dating until my work was done.
But I knew that she took my words to mean that I was busy going out with someone else. It made me very uncomfortable, especially when she said something to the effect of wishing me that it should go well or something like that.
It’s a good thing that the conversation took place over the phone or my face would totally have given me away. I’m a very bad liar. But I did feel like it was necessary in this case. And it wasn’t a total lie -both because I was technically busy and also I really did have someone I should have been going out with but had pushed off until I finished my work.
I really don’t think that any of the cases you are talking about are a problem, but I recommend asking a Rav for one simple reason – I think you will feel much better about it if the Rav tells you it’s fine and explains why.