In many cities there are offices which are open to 18.00 or 20.00. The phone number for customer services is 9800-7100. Stamps can be bougth at post offices, most kiosks and department stores, hotels, and some gas stations. In some suburbs and rural areas postal service is provided by a local grocery store or kiosk. Poste Restante service is available at every post office.
Elderly Discounts given to elderly people vary.
You are most likely get them at Finnair and in some museums, concerts, etc. In some establishments and transportation children up to 17 years of age receive some kind of discounts. In case of an emergency, dial 112. All hospitals have doctors on duty around the clock. In larger cities there is at least one pharmasist open late in the evening and at weekends.