wrote:
Why do they not advertise such information to help pensioners and
disabled persons if they are not aware of this?

They do. You just have to check the TfL Web site. Obviously there's a lot
of stuff that changed yesterday, and what's important to you isn't to
everyone, so you need to seek out the things you need to know. It was also
discussed here.

For example, from
https://tfl.gov.uk/campaign/new-fares?intcmp=23318

Discounted and free travel

All TfL discounted and free travel that currently apply to Tube, DLR and
London Overground services will also apply on those transferring to London
Overground and TfL Rail. In a number of cases this will mean cheaper fares
and additional free travel:

Under 11s will be able to travel free with a 5-10 Oyster photocard or when
accompanied by an adult with a valid ticket or using pay as you go

Flat fares will apply across Zones 1-6 for holders of 11-15 Oyster
photocards:
85p peak
75p off-peak

Holders of Freedom Passes, 60+ London Oyster photocards and Veterans Oyster
photocards will be able to travel free at all times