"reaching their end" is correct and usable in written English.
You could use it in a variety of contexts to refer to a group of entities coming to the end of their lifespan, journey, or purpose. For example: The ancient Mayan cities, reaching their end in the 15th century, left behind a rich cultural legacy.
Specifically, one SSc will be launched to an orbital slot near the depot when multiple GEO satellites are reaching their end of lives.
He also stressed that while some companies open source projects when they are reaching their end of life, this isn't the case here at all.
That the bad old days when a small, vociferous group of angry Cuban exiles could effectively dictate what could be said or done in Cuba-related matters are reaching their end.
All computed sintering trajectories have a common shape, being very flat at low densities and exhibiting most grain growth in the last 5% of densification before reaching their end-point density.
I shall almost certainly die before the 90s reach their end.
Additional stocks of Tamiflu are due to reach their end of shelf life and be replaced during 2013-14 at a cost of £49 million, the NAO said.
With all of this functionality folded into Google Drive, the existing Quickoffice apps will soon reach their end of life.
Each month, thousands upon thousands of contracts reach their end, making the competitor's offerings a whole lot more intriguing for the now unshackled mobile consumers.
In the periods 1997 2003, 103 spacecraft reached their end of life; 34 were reorbited in compliance with the IADC recommendation, 35 were reorbited below the minimum recommended altitude, and 34 were abandoned without any end-of-life disposal manoeuvre.
A future application of this technology will be the use of small drag sails as low-cost devices to de-orbit LEO satellites, when they have reached their end of life, without having to use expensive propulsion systems.
The only thing missing was rap music, but the duo soon to be known as HardWhite and RockBottom (like Simon and Garfunkel) would get to that by the time they reached their end….
