Christmas money for grown up grandkids

Just because the GC are earning ‘good money’ themselves, it doesn’t mean that they won’t appreciate money from you as well.
You don’t know how much disposable income they have anyway - they might be paying high rent and trying to save money for a house deposit at the same time, for instance.
And what if they lost their job? Would you then start giving them money again?

I agree with Calendargirl that unless you know what they really like, you risk giving something that is just an embarrassment.

My DMiL always gave us each some money & I enjoyed spending it on something for myself that I wouldn’t have otherwise bought.

I have 9 GC, 6 of whom are grown ups now, I stop giving them birthday money at 18. They were perfectly understanding about it. So there are 3 that still either buy presents or give money but I now have 5 GrtGC as well so I’m back in the same dilemma ?.
As others have said have a chat with them I’m sure they’ll understand.

Just wonder what type of ‘pressy under the tree’ you give. We all feel a present to open is nice, but I honestly think that unless you know it’s something they really want, just stick to a bit of money.
My dear old mum kept giving the GC things to open, often useful presents such as socks or underpants, until my DS had to mention that he needed a larger size than she kept buying him.
Toiletries and suchlike often end up in charity shops if they don’t suit, and chocolates likewise.

I think if you have a word with them early and explain that your income has now reduced as you've retired they're adults and will understand especially if they're earning themselves. Speak to the parents of the younger ones and tell them the same - the children will probably be happier with a little gift to open anyway

I gave everyone money last year - apart from our two youngest grandsons who live in NZ but were here for Christmas. Our other GC are adults and their family live 2 hours away. This year we will be even further away as we're moving and with Covid it's doubtful we'll see any of them at all - we haven't seen them since last Christmas .

You have to cut your costs according to your means. Your needs have changes and you now have a finite amount to spend. I think that older grandchildren are probably in a better financial position than you may be at this time so no it's not mean to cut out or reduce a cash gift to be within your means.
As an aside, do these adult grandchildren give you presents?