Their campaign dates back to when Gurkha pensions were increased in 2007 but the hike did not apply to those who left the army before the Royal Gurkha Rifles were moved from Hong Kong to the UK in 1997.
According to The Times, one group of Gurkhas now plans to undertake an initial 13-day hunger strike before Remembrance Sunday on November 10 - held to mark the end of World War I - with one day for each Victoria Cross won by Gurkhas since they were first recruited to the army in 1815.
Before the 2007 increase, Gurkha pensions, based on the cost of living in Nepal where most of them retired, were about a third of those for British veterans.
In 2010, the Gurkhas lost a test case for equal pensions for those who left before the cut-off date. The year before, all Gurkha ex-servicemen gained the right to reside in Britain.
A Ministry of Defence spokesman said the Gurkhas have been "fairly treated" in respect to their pensions.
"The Gurkha Pension Scheme is a very fair scheme, a view upheld by the Court of Appeal. For most Gurkhas it provides a pension at least as good, and in many cases better, than that given to their British counterparts with identical periods of service," he said.
