lǎo rén
你到了天津来封信，免得家里老人惦记着。
nǐ dàole Tiānjīn lái fēng xìn, miǎnde jiālǐ lǎorén diànjìzhe.
Send a letter when you arrive in Tianjin, so the elderly at home won't worry about you.
老人老办法，新人新办法。
lǎo rén lǎo bànfǎ, xīn rén xīn bànfǎ.
Old people have old methods, new people have new methods.