In the men's game only three players; Samoa's Brian Lima and Italy duo Mauro Bergamasco and Sergio Parisse have played at five World Cups.
In the women's game, former New Zealand fly-half Anna Richards was part of five World Cups between 1991 and 2010, winning the title four times.
Fiao'o Fa'amausili also won four World Cups for the Black Ferns across her five tournaments, from 2002-2017. Scotland's Donna Kennedy also played at five World Cups - her first coming in 1994.
Hosts England are favourites to win the World Cup, which gets under way on 22 August.
They defeated France 43-42 in a thriller at Allianz Stadium, Twickenham in April to secure their fourth consecutive Six Nations Grand Slam.
Megan Jones has established herself as John Mitchell's starting outside centre, but Scarratt - despite missing out on England's matchday squad for the Grand Slam win over France - remains a valuable squad member in a position where competition for places is high.
The Red Roses are on a 25-game winning run as they count down to their home World Cup, which starts against the United States at Sunderland's Stadium of Light.
The squad assembled on Monday for the first time and will be cut down to 32 players for the tournament.
England, who were world champions in 2014, narrowly missed out in dramatic fashion at Eden Park in 2022 against New Zealand.
"We know how important and exciting 2025 is for women's rugby in England," Mitchell said. "Today is the start of little wins where we will work hard into the tournament."
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