Microsoft Apps not getting updated

Microsoft Support – Upgrade macOS to continue receiving Microsoft 365 and Office for Mac updates

"If you're on an unsupported version of macOS, your Office apps will still work but you would no longer receive any updates including security updates. For example, if you're on macOS Monterey, but later you don't update your macOS to a supported version when macOS Monterey is no longer supported, you won't receive any updates of any kind."

New users don't have the option of using Monterey, at least not officially:

"Note that new installs of Microsoft 365 for Mac require macOS Ventura or later."

How essential is it that you need to update your Microsoft apps? They will still run ok on your machine and MS are usually better than Apple for backwards compatibility, i.e. still supporting documents created with older versions.

sumbulb wrote:

My MacBook Air is 2015. macOs 13 is compatible with 2020 and later.

A 2018 MacBook Air would be able to run Ventura or even Sonoma. A 2020 one could run the current version of macOS – Sequoia.

However, if you were looking for a new Mac notebook, it would make sense to look for a current MacBook Air or MacBook Pro, based upon a M4-family chip (plain M4, M4 Pro, or M4 Max).

If Apple keeps to the same macOS release schedule that they have followed for the previous ten years, we can expect Sequoia's successor to come out some time in September, October, or November of 2025. At that time, Ventura will fall off the list of the "most recent three", and Microsoft will stop providing 365 / Office updates for Ventura users, just as they have already stopped providing them for Monterey users.

sumbulb wrote:

I cannot update Microsoft Apps as it says it requires the latest macOS 13. However, macOS 13 is not compatible with my hardware. My MacBook Air is 2015. macOs 13 is compatible with 2020 and later. Is there any alternate way?

No, upgrade youur macbook air if you want to continue using Microsoft products.

You can use libre in the meantime.